Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-04-10, 04:54 PM   #1
Lawrence08648
Advisor
Thread Starter
 
Join Date: Mar 2008
Location: Central New Jersey
Bikes:
Posts: 544
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
max # of mm above headset for spacers

For an installed fork and steerer, what is the safe maximum above the headset in mm for a carbon and an aluminum steerer? I want to order a frame and then cut the steerer tube and leave the maximum which will give me the opportunity to make it shorter as I choose.
Lawrence08648 is offline   Reply With Quote
Old 10-04-10, 05:35 PM   #2
ClarkinHawaii 
Senior Member
 
ClarkinHawaii's Avatar
 
Join Date: Jan 2010
Location: Wahiawa. Oahu
Bikes:
Posts: 1,698
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
carbon is rumored to be 1.5" of spacers max between the headset and the stem for a 1-1/8" steerer

Aluminum is basically OK to use the whole uncut length if you want to--but be reasonable. It depends on how much torque and stress is going to be put on it. If you plan on downhill leaps into boulder-strewn gullies, common sense would suggest less spacer stack than leisurely rides around town.

Sheldon shows a photo of one of his bikes where he has a locking headset spacer immediately above the headset; and then the stem installed several inches above it, with no spacers in between.
ClarkinHawaii is offline   Reply With Quote
Old 10-04-10, 06:24 PM   #3
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,086
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Spacers above the stem, will allow you to try out the extra handle bar height adjustments ,
before you commit Hack Saw.

I use a locking spacer directly above the Integrated Headset, as there is just a jumble of parts
when I take the stem off without it.
fietsbob is offline   Reply With Quote
Old 10-04-10, 06:31 PM   #4
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Bikes: Bianchi, Miyata, Dahon, Rossin
Posts: 12,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
usually the fork manufacturer will specify maximum extension above the headset.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
http://sanfrancisco.ibtimes.com/arti...ger-photos.htm
AEO is offline   Reply With Quote
Old 10-04-10, 06:47 PM   #5
bellweatherman
Senior Member
 
bellweatherman's Avatar
 
Join Date: Aug 2005
Location: Austin
Bikes: Too many to count
Posts: 2,103
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This really depends. I too have heard the 1.5" general rule of thumb. Don't know where that came from, but it's got to be made up. If you are running a superlight fork, then I'd be wary to have a lot of steerer exposed. However, for the really tall guys on smallish frames, you don't really have much of a choice. I know a guy, pro basketball player, who had to have a ton of spacers. He couldn't get a frame his size without going custom, so he just went with the largest size the bike shop had and stacked a ton of spacers on there.
bellweatherman is offline   Reply With Quote
Old 10-04-10, 07:55 PM   #6
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
Posts: 3,769
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by bellweatherman View Post
This really depends. I too have heard the 1.5" general rule of thumb. Don't know where that came from, but it's got to be made up. If you are running a superlight fork, then I'd be wary to have a lot of steerer exposed. However, for the really tall guys on smallish frames, you don't really have much of a choice. I know a guy, pro basketball player, who had to have a ton of spacers. He couldn't get a frame his size without going custom, so he just went with the largest size the bike shop had and stacked a ton of spacers on there.
Sounds like he should have got a custom bike. Maybe they should be paying pro basketball players a little more.

Some manufacturers specify a maximum spacer amount. Some do not. Forks with very tight limitations on spacers will tend to be very lightweight racing models.
LarDasse74 is offline   Reply With Quote
Old 10-04-10, 08:37 PM   #7
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,689
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
General manufacturers recommendation for carbon steerers:

1. For a 1" steerer, a maximum of 25 mm of spacers.
2. For a 1-1/8" steerer most say 35 mm maximum and Easton says 50 mm maximum.

For aluminum, and particularly Cr-Mo, the sky is the limit for 1-1/8" steerers but, as Clark said, be reasonable.
HillRider is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 06:59 AM.